[Bug 2007402] Re: apt-get update error ubuntu22.04

[Paul White]

** Package changed: ubuntu => apt (Ubuntu)

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Title:
  apt-get update error ubuntu22.04

Status in apt package in Ubuntu:
  Invalid

Bug description:
  I'm using ubuntu:22.04, but unfortunately we met a error when apt-get
  update.

  below is the error message:

  root at 7f7f478253a4:/# apt-get update
  Get:1 http://archive.ubuntu.com/ubuntu jammy InRelease [270 kB]              
  Get:2 http://security.ubuntu.com/ubuntu jammy-security InRelease [110 kB]    
  Err:2 http://security.ubuntu.com/ubuntu jammy-security InRelease    
    The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C
  Err:1 http://archive.ubuntu.com/ubuntu jammy InRelease
    The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C
  Get:3 http://archive.ubuntu.com/ubuntu jammy-updates InRelease [119 kB]
  Err:3 http://archive.ubuntu.com/ubuntu jammy-updates InRelease
    The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C
  Get:4 http://archive.ubuntu.com/ubuntu jammy-backports InRelease [107 kB]
  Err:4 http://archive.ubuntu.com/ubuntu jammy-backports InRelease
    The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C
  Reading package lists... Done
  W: http://security.ubuntu.com/ubuntu/dists/jammy-security/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg are ignored as the file is not readable by user '_apt' executing apt-key.
  W: http://security.ubuntu.com/ubuntu/dists/jammy-security/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2018-archive.gpg are ignored as the file is not readable by user '_apt' executing apt-key.
  W: GPG error: http://security.ubuntu.com/ubuntu jammy-security InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C
  E: The repository 'http://security.ubuntu.com/ubuntu jammy-security InRelease' is not signed.
  N: Updating from such a repository can't be done securely, and is therefore disabled by default.
  N: See apt-secure(8) manpage for repository creation and user configuration details.
  W: http://archive.ubuntu.com/ubuntu/dists/jammy/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg are ignored as the file is not readable by user '_apt' executing apt-key.
  W: http://archive.ubuntu.com/ubuntu/dists/jammy/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2018-archive.gpg are ignored as the file is not readable by user '_apt' executing apt-key.
  W: GPG error: http://archive.ubuntu.com/ubuntu jammy InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C
  E: The repository 'http://archive.ubuntu.com/ubuntu jammy InRelease' is not signed.
  N: Updating from such a repository can't be done securely, and is therefore disabled by default.
  N: See apt-secure(8) manpage for repository creation and user configuration details.
  W: http://archive.ubuntu.com/ubuntu/dists/jammy-updates/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg are ignored as the file is not readable by user '_apt' executing apt-key.
  W: http://archive.ubuntu.com/ubuntu/dists/jammy-updates/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2018-archive.gpg are ignored as the file is not readable by user '_apt' executing apt-key.
  W: GPG error: http://archive.ubuntu.com/ubuntu jammy-updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C
  E: The repository 'http://archive.ubuntu.com/ubuntu jammy-updates InRelease' is not signed.
  N: Updating from such a repository can't be done securely, and is therefore disabled by default.
  N: See apt-secure(8) manpage for repository creation and user configuration details.
  W: http://archive.ubuntu.com/ubuntu/dists/jammy-backports/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg are ignored as the file is not readable by user '_apt' executing apt-key.
  W: http://archive.ubuntu.com/ubuntu/dists/jammy-backports/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2018-archive.gpg are ignored as the file is not readable by user '_apt' executing apt-key.
  W: GPG error: http://archive.ubuntu.com/ubuntu jammy-backports InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C
  E: The repository 'http://archive.ubuntu.com/ubuntu jammy-backports InRelease' is not signed.
  N: Updating from such a repository can't be done securely, and is therefore disabled by default.
  N: See apt-secure(8) manpage for repository creation and user configuration details.

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